Hot flashes ...sign of labor?

JJ • River Henry 5/6/18 and number 2 due in September/October!

I’m almost 36 weeks. For the past three days I have crazy horrible hot flashes at night. I mean I need a fan, the air conditioner, and a wet towel draped over me for comfort. Its kept me up for hours now. Is this just normal late pregnancy? Or is this a sign of labor soon?